decadence
n[U]
(a) (falling to a) lower level (in morals, art, literature, etc) esp after a period at a high level (道德伦理、 艺术、 文学等的)衰落, 堕落(尤指经过一鼎盛时期後)
the decadence of late Victorian art 维多利亚晚期文艺的衰落.
(b) attitude or behaviour that shows this 表现出此种衰落的态度或行为
the decadence of the rich Western countries 富裕的西方国家中的颓废行为.